Unable to ssh out from my laptop

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http://unix.stackexchange.com – I'm unable to ssh from a particular machine, either from my Ubuntu 12.04 install or my Windows Vista install (using putty). I'm trying to ssh into a remote machine where I have an account, but I keep getting a "connection refused" error. However, from another computer in my office using the same setup, I can connect just fine Here is the ouput of dig sun.chpc.ac.za: ; <<>> DiG 9.8.1-P1 <<>> sun.chpc.ac.za ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55409 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, A (HowTos)